To use LispWorks with SLIME you need an image which does not start the LispWorks IDE automatically. Create this image in
~/lw-console
as described in Saving a non-GUI image with multiprocessing enabled.
Download SLIME from
http://common-lisp.net/project/slime/
and configure Emacs to use
"~/lw-console"
as the value of
inferior-lisp-program
as shown in the SLIME README.
Note: Use of LispWorks Personal Edition with SLIME is not supported.